Commercial Test on Technology for High-Temperature Cracking of C5 Fraction to Decrease Olefin Content of Gasoline in DCCU

During June and July 2003, Jingmen Petrochemical Company carried out thecommercial test on technology for high-temperature cracking of C_5 fraction to decrease olefincontent of gasoline in DCCU. The test results showed that the olefin content of DCC gasoline haddecreased from 68.32m% to 42.5m%, meanwhile the propylene yield increased by 0.90m%.

联合颈部血管彩超及DSA评估动脉粥样斑块与脑梗死关联性的意义

目的探讨颈部血管彩超及DSA在动脉粥样硬化性脑梗死中的临床应用价值。方法以120例动脉粥样硬化性脑梗死患者为患者组,75例未发生脑梗死患者为对照组,经颈部血管彩超及DSA检查。结果二者颈动脉粥样斑块发生率差异有统计学意义,120例脑梗死患者中,颈动脉及椎动脉粥样斑块发生率为81%,对照组仅有13%。颈动脉斑块最常见颈总动脉分叉处,其次为颈动脉颅内段,椎动脉以起始段多见,其次为基底动脉分布,多以病灶同侧多见,易形成血管狭窄及血流动力学改变。结论颈动脉粥样硬化与脑梗死的发病存在关联性:联合颈部血管彩超与DSA能早期准确发现颈动脉粥样硬化斑块及了解斑块的狭窄率,对预防或治疗脑梗死的发生有重要意义。

降低催化裂解联合装置能耗的技术管理

分析了催化裂解联合装置能耗高的各种原因，并相应提出了降低其能耗的多种措施，经实践证明效果明显。